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22
дисперсии водного раствора рыбного коллагена и бутилакрилата. После проведения синтеза водную и органическую фазу реакционной смеси анализировали по составу и молекулярно-массовым параметрам методами инфракрасной спектроскопии и гель-проникающей хроматографии. В выделенном из водной фазы сополимере наблюдались изменения, свидетельствующие об образовании сополимера, в случае системы триэтилборан-кислород более ярко выраженные. Выдвинуто предположение, что формирование макромолекул сополимера для динитрила азоизомасляной кислоты и элементорганического инициатора проходит по разным схемам. Предложены схемы формирования макромолекул сополимера для динитрила азоизомасляной кислоты и элементорганиче-ского инициатора. В выделенной органической фазе присутствует только полибутилакрилат. Также были проведены биологические исследования полученных сополимеров на фунгицидные свойства и бактерицидную активность.
Ключевые слова: коллаген, триэтилборан, бутилакрилат, бактерицидный полимер, привитая сополимеризация
Благодарности: Работа проводилась на оборудовании, предоставленном Центром коллективного пользования «Новые материалы и ресурсосберегающие технологии» Нижегородского государственного университета им. Н.И. Лобачевского.
Для цитирования: Уромичева М.А., Кузнецова Ю.Л., Валетова Н.Б., Митин А.В., Семенычева Л.Л., Смирнова О.Н. Синтез привитого сополимера полибутилакрилата на рыбный коллаген. Известия вузов. Прикладная химия и биотехнология. 2021. Т. 11. N 1. С. 16-25. https://doi.org/10.21285/2227-2925-2021-11-1-16-25
INTRODUCTION
The use of secondary resources of the food industry is an important task. Waste from the fishing industry: skin, fins, tail contains collagen [1, 2]. Materials based on fish collagen have a number of advantages compared to the analogue of animal origin: first of all, it is a greater structural similarity with human collagen, providing a higher level of bio-compatibility [1, 3-5].
Hybrid materials with the inclusion of collagen and polymers of another nature are widely used in medicine [6, 7], pharmacy [8], cosmetology [9, 10]. To obtain copolymers of collagen and its denaturant - gelatin with synthetic monomers, radical initiators of various nature are most often used [11-13], including trialkyl boranees [14-16]. Grafted copolymers [17] of polymethyl methacrylate and gelatin in aqueous dispersion were synthesized and characterized in the presence of tributyl borane and traces of oxygen. In terms of practical use, it is important that samples of the new material are biodecom-posed, i.e. have the destruction prospect in the presence of microorganisms.
The aim of this work is the synthesis of grafted copolymer of polybutyl acrylate (PBA) with fish collagen in the presence of various initiators: azobisi-zobutyronitrile (AIBN) and the initiating triethyl borane (TEB) - oxygen system. The main task of the research is to determine the composition of grafted copolymers and molecular weight characteristics.
EXPERIMENTAL PART
Preparation of initial materials for the experiment. The initial collagen was isolated from cod skin in the form of acetic dispersion by the method [18].
Butyl acrylate (BA) for purification from the inhibitor was washed with 5% soda solution and then with distilled water to a neutral medium. The washed
butyl acrylate was dried with anhydrous sodium sulfate and further purified by vacuum distillation.
AIBN was purified from impurities by recrystalli-zation of this initiator from alcohol solution. To do this, it was dissolved in ethyl alcohol at 40 °C in a water bath. The hot solution was filtered and then cooled to recrystallize AIBN. The lade-down crystals were dried in a vacuum at 25 °C.
To improve the safety of operation and storage, TEB was used in combination with hexamethylene diamine, which releases the initiator in the acidic reaction medium.
Fish collagen extraction method. Collagen was extracted from the cod skin, which was cleaned of scales, lumps of muscle tissue and fat, washed with distilled water, frozen. The raw cod skin was cleaned of scales, lumps of muscle tissue and fat, washed with water and frozen. Prepared and frozen raw materialwas crushed with scissors and placed in 3% acetic acid for a day at 25 °C, after which the resulting the collagen dispersion was separated using a filter with a pore size of 1 ^m from parts of the crushed fish skin and other impurities. We used the isolated aqueous solution of collagen in 3% acetic acid. The mass fraction of collagen in the resulting solution is 8%.
Method of butyl acrylate copolymer synthesis with collagen. Synthesis of collagen and butyl acrylate copolymers with both initiators was carried out, as follows. The mixture of aqueous 3% solution of collagen and butyl acrylate in a weight ratio of 1:1 was bubbled by argon for 15 minutes at room temperature and intensive stirring before synthesis. The initiator in amount of 1% from weight of collagen was added to mixture and quickly heated to 50 °C, without ceasing to stir intensively. The synthesis was carried out for 1 hour in an argon atmosphere. The organic phase was separated from the aqueous
layer by decantation. The copolymer is in the aqueous phase.
Method of composition determining of the aqueous phase of butyl acrylate copolymer with collagen. The composition of the obtained materials was studied using infrared (IR) spectroscopy. IR spectrophotometer "IRPrestige-21" manufactured by Shimadzu, Japan, was used to record IR spectra of absorption. Films on the KBr plate were prepared to record the IR spectrum. The spectra interpretation was carried out independently.
Method of composition determining of the organic phase of butyl acrylate copolymer with collagen. The organic layer of the synthesized copolymers was investigated in a chloroform solution by IR-Fourier-transform spectrophotometer Shimadzu FTIR-8400S in KBr cells with an optical path length of 0.26 mm in the wave number range 5500550 cm-1, the error in the determination did not exceed ±0.05 cm- . The copolymer composition was determined using a calibration graph on the characteristic peak area of the analytical band at 1726 cm-1, which corresponds to the presence of a carbonyl group. The proportion of butyl acrylate was calculated according to the intensity of this band.
The calibration curve was plotted in the absorption intensity (optical density) - concentration axes (Fig. 1) by absorption of poly methyl methacrylate (PMMA) solution. This method used MMA, not BA due to polybutyl acrylate is insoluble.
Fig. 1. Calibration curve for determining the copolymers composition
Рис. 1. Градуировочный график для определения состава сополимеров
Spectra of PMMA solutions in chloroform of precisely known concentration (0.2-1.0% PMMA) were integrated to plot the curve. Absorption intensity was determined by the "baseline" method [19]. The error in determining the concentration of fragments in the copolymer was ±5%.
The calculation of PBA mass fraction in the copolymer organic layer was carried out according to the formula:
M(BA) D m(BA)
w(BA) = ( ) x-x —(—, were.
v ' M(MMA) 1,095 m(CHCl3)
D is the optical density of polymethyl methacrylate, M(BA) is the molar mass of butyl acrylate, m(BA) is the mass of butyl acrylate, M(MMA) is the molar mass of methyl methacrylate, according to which the calibration graph was used, m(CHCl3) is the mass of chloroform in which the solution was prepared, 1.096 is the slope of the calibration curve.
The experiment showed that 100% PBA is formed in the organic layer when both initiators are used.
Analysis of molecular weight characteristics of the copolymer of butyl acrylate with collagen. The molecular weight characteristics of collagen and collagen-containing copolymers were studied by size-exclusion chromatography (SEC). This method is based on the molecule separation by volume sizes. Sample preparation was carried out by filtration using nozzle membranes Millipore Millex-LCR (PTFE 0.45 ^m). To do this, a disposable syringe filled with a collagen aqueous solution was fitted with a nozzle membrane Millipore Millex-LCR and filtered at a rate of about 1.2 ml/min.
Method for determining fungal resistance and bactericidal activity. Tests for fungal resistance were carried out in accordance with GOST 9.049-91 "Unified system of corrosion and ageing protection. Po-limer materials and their components. Methods of laboratory tests for mould resistance". Microscopic fungi, active destructors of polymeric materials, were used as test cultures: Aspergillus niger, Aspergillus terreus, Aspergillus oryzae, Chaetomium globosum, Paecilillomyces variotium Penicillium cy-cloryspium, Penicillium funiculosum, Trichoderma viride. Samples were placed in Petri dishes. Then the surface of the samples was inoculated with a suspension of micromycete spores and the Petri dishes with the samples were placed in a thermostat. The test duration is 28 days at a temperature of 29±2 °C and a humidity of more than 90%.
The bactericidal activity was determined in relation to the association of test cultures of bacteria: Escherichia coli, Staphylococcus aureus, Pseudomona aeruginosa, Bacillus subtilis. The presence of bactericidal properties was assessed by the size of the zone of inhibition of bacterial growth around the test object placed on an agar MPA medium. Cultivation conditions - in a thermostat at 37 °C. Exposure time - 24 hours.
RESULTS AND DISCUSSION
In connection with stated objective, the synthesis of grafted collagen copolymers with PBA was carried out at the AIBN initiation and the TEB-oxygen initiating system under comparable conditions. After the synthesis, the resulting copolymer was separated by decantation into an organic viscous layer and a liquid aqueous layer. 100% of homopolybutyl acrylate was found in the viscous organic phase.
The IR spectra of the samples isolated from the aqueous phase for the studied initiators are shown in Fig. 2 and Fig. 3 in comparison with the IR spectra of collagen and PBA. For the sample from the reaction mixture using the AIBN initiator, as in the case of the TEB initiator, a change is observed compared to the IR spectra of the original collagen and PBA.
Molecular weight (MW) characteristics of samples with different initiators isolated from the aqueous phase are presented in the form of molecular weight distribution MWD curves (Fig. 4, 5) and MW values in Table.
The MWD curves for samples obtained under different conditions are offset with respect to the collagen MWD curve. In the case of copolymeriza-tion initiation by the TEB - oxygen system, this offset is more noticeable. Presumably this indicates a
greater proportion of PBA grafting to collagen when initiated by an organometallic initiator. These data are confirmed by the values of MW of grafted copolymer, obtained using the TEB - oxygen system: they are higher than the original collagen by a greater amount than in the case of AIBN.
The obtained data testify that BA grafting to collagen in the presence of the TEB - oxygen system is more visible than for AIBN. This may be due to the fact that both upon initiation with a metal-containing initiator and AIBN, grafting is carried out (2) due to the abstraction of a hydrogen atom by an active radical (R •, RO •) from a collagen macro-molecule (1) by active radicals formed in the case of AIBN due to thermal decomposition of the initiator, or due to the oxidation of thermopile according to the known scheme [20].
Fig. 2. Infrared spectra of collagen (1), collagen and BA copolymer initiated by azobisisobutyronitrile (2),
and polybutyl acrylate (3)
Рис. 2. Инфракрасные спектры коллагена (1); сополимера, инициированного динитрилом азоизомасляной кислоты (2);
полибутилакрилат (3)
1----2
Fig. 3. Infrared spectra of collagen (1), collagen and BA copolymer initiated by the system triethyl borane - oxygen (2),
and poly butyl acrylate (3)
Рис. 3. Инфракрасные спектры коллагена (1), сополимера, инициированного системой триэтилборан - кислород (2),
и полибутилакрилат(3)
Fig. 4. Collagen (1) weight distribution and copolymer of collagen and butyl acrylate in the presence of azobisisobutyronitrile (2)
Рис. 4. Молекулярно-массовое распределение коллагена (1) и сополимера коллагена и бутилакрилата в присутствии динитрила азоизомасляной кислоты (2)
1----2
Fig. 5. Collagen (1) weight distribution and copolymer of collagen and BA in the presence of the system triethyl borane - oxygen (2)
Рис. 5. Молекулярно-массовое распределение коллагена (1) и сополимера коллагена и БА в присутствии системы триэтилборан - кислород (2)
Collagen molecular weight characteristics and copolymers of collagen and butyl acrylate in the presence of azobisisobutyronitrile and the system triethyl borane - oxygen
Молекулярно-массовые характеристики коллагена и сополимеров коллагена и бутилакрилата в присутствии динитрила азоизомасляной кислоты и системы триэтилборан - кислород
Polymer MWD
Mn10-3 Mw10-3 Mw/Mn
Collagen 182 228 1.3
Copolymer with azobisisobutyronitrile initiator 189 238 1.3
Copolymer with the system triethyl borane - oxygen initiator 239 291 1.2
Et3B + 02 —Et2BOO • + Et • Et • + 02 —► EtOO • EtOO» +Et3B —EtOOBEt2 + Et
EtOOBEt2 + Et3B
Et2BOEt + Et2BO • + Et •
Et2BOBEt2 + ЕЮ • + Et
(1)
(2)
(3)
(4)
(5)
(6)
However, when the TEB - oxygen system initi- with a growing radical, a labile bond is formed, along ates the interaction of TEB with collagen (7) or a which the growth of the chain can pass through the boroxyl radical formed according to the scheme: (6) mechanism of reversible inhibition (8) [21, 22].
+Et3B
(7)
(8)
Chain breakage by quadratic breakage of growing radicals leads to breakage of the polymer chain.
CONCLUSION
Grafted collagen copolymers with polybutyl acry-late were obtained in the aqueous phase of dispersion of aqueous collagen solution and butyl acrylate at initiation of AIBN and TEB - oxygen initiation system. The copolymers were characterized on the
composition and molecular weight parameters using IR spectroscopy and SEC. In case of the TEB - oxygen system, butylacrylate grafting is more pronounced. The scheme for the formation of copolymer macromolecules to organoelement and AIBN initiator were proposed.
These compositions can be used as mushroom resistant and bactericidal materials.
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СПИСОК Л
1. Rajasree S.R.R., Gobalakrishnan M., Aranganathan L., Karthih M.G. Fabrication and characterization of chitosan based collagen gelatin composite scaffolds from big eye snapper Priacan-thus hamrur skin for antimicrobial and anti oxidant applications // Materials Science and Engineering: C. 2020. Vol. 107. 110270. https://doi.org/10.1016/ j.msec.2019.110270
2. Pattanaik S.S., Sawant P.B., Xavier K.A.M., Dube K., Srivastava P.P., Dhanabalan V., et al. Characterization of carotenoprotein from different shrimp shell waste for possible use as supplementary nutritive feed ingredient in animal diets // Aquaculture. 2020. Vol. 515. 734594. https://doi.org/10. 1016/j.aquaculture. 2019.734594
3. Dale H.F., Madsen L., Lied G.A. Fish-derived proteins and their potential to improve human health // Nutrition Reviews. 2019. Vol. 77. Issue 8. P. 572583. https://doi.org/ 10.1093/nutrit/nuz016
4. Eshar D., Wyre N.R., Schoster J.V. Use of collagen shields for treatment of chronic bilateral corneal ulcers in a pet rabbit // Journal of Small Animal Practice. 2011. Vol. 52. Issue 7. P. 380-383. https://doi.org/10.1111/j.1748-5827.2011.01077.x
5. Greenwald Y., Kleinmann G. Use of collagen shields for ocular-surface drug delivery // Expert Review of Ophthalmology. 2008. Vol. 3. Issue 6. P. 627-633. https://doi.org/10.1586/17469899.3.6.627
6. Fitzpatrick S.D., Mazumber M.A.J., Lasowski F., Fitzpatrick L.E., Sheardown H. PNIPAAm-grafted-collagen as an injectable, in situ gelling cell delivery scaffold // Biomacromolecules. 2010. Vol. 11. Issue 9. P. 2261-2267. https://doi.org/10.1021/ bm100299j
7. Ma Z., Gao C., Gong Y., Shen J. Cartilage tissue engineering PLLA scaffold with surface immobilized collagen and basic fibroblast growth factor // Biomaterials. 2005. Vol. 26. Issue 11. P. 12531259. https://doi.org/10.1016/j.biomaterials.2004. 04.031
8. Muthukumar T., Sreekumar G., Sastry T.P., Chamundeeswari M. Collagen as a potential biomaterial in biomedical applications // Reviews on Advanced Materials Science. 2018. Vol. 53. Issue 1. P. 29-39. https://doi.org/ 10.1515/rams-2018-0002
9. Khanna N.D., Kaur I., Bhalla T.C., Gautam N. Effect of biogradation on thermal and crystalline behavior of polypropylene-gelatin based copolymers // Journal of Applied Polymer Science. 2010. Vol. 118. Issue 3. P. 1476-1488. https://doi.org/10.1002/app. 32434
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11. Ohya S., Matsuda T. Poly(N-isopropylacry-lamide) (PNIPAM)-grafted gelatin as thermorespon-
sive three-dimensional artificial extracellular matrix: Molecular and formulation parameters vs. cell proliferation potential // Journal of Biomaterials Science, Polymer Edition. 2005. Vol. 16. Issue 7. P. 809-827. https://doi.org/10.1163/1568562054255736
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13. Ollivier C., Renaud P. Organoboranes as a source of radicals // Chemical Reviews. 2001. Vol. 101. Issue 11. P. 3415-3434. https://doi.org/10.10 21/cr010001p
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16. Kuznetsova Yu.L., Abramova N.A., Ludin D.V. Synthesis of copolymers of methyl methacry-late and butyl vinyl ether in the presence of the system tributylboron - 2,5-di-tert-butyl-p-benzoquinone // Bulletin of the South Ural State University. Ser. Chemistry. 2016. Vol. 8. Issue 1. P. 26-33. https:// doi.org/10.14529/chem160104
17. Kuznetsova Yu.L, Morozova E.A., Vavilova A.S., Markin A.V., Smirnova O.N., Zakharycheva N.S., et al. Synthesis of biodegradable grafted co-polymers of gelatin and polymethyl methacrylate // Polymer Science. Series D. 2020. Vol. 13. P. 453459. https://doi.org/10.1134/s1995421220040115
18. Пат. № 2567171, Российская Федерация. Способ получения уксусной дисперсии высокомолекулярного рыбьего коллагена / Л.Л. Семе-нычева, М.В. Астанина, Ю.Л. Кузнецова, Н.Б. Ва-летова, Е.В. Гераскина, Таранкова О.А.; патентообладатель ООО «Системы качества жизни»; заявл. 06.10.2014; опубл. 10.11.2015. Бюл. 31.
19. Zimmermann B., Baranovic G. Thermal analysis of paracetamol polymorphs by FT-IR spec-troscopies // Journal of Pharmaceutical and Biomedical Analysis. 2011. Vol. 54. Issue 2. P. 295-302. https://doi.org/10.1016/jJpba.2010.08.023
20. Okamura H., Sudo A., Endo T. Generation of radical species on polympropylene by alkyl-borane-oxygen system and its application to greft polymerization // Journal of Polymer Science: Part A: Polymer Chemistry. 2009. Vol. 48. Issue 22. P. 6163-6167. https://doi.org/10.1002/pola.23659
21. Semenycheva L.L., Matkivskaia Y.O., Vale-tova N.B., Chasova Y.O., Pegeev N.L., Eloyan A.L., et al. Specific features of "compensating" copoly-merization of butyl acrylate with vinyl butyl ether in the presence of triethylboron // Russian Chemical
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INFORMATION ABOUT THE AUTHORS
Marina A. Uromicheva,
Undergraduate, Lobachevsky State University of Nizhny Novgorod,
23, Gagarin Ave., Nizhny Novgorod, 603022,
Russian Federation,
e-mail: kozinamarina1@yandex.ru
Yulia L. Kuznetsova,
Cand. Sci. (Chemistry), Associate Professor, Department of Organic Chemistry, Lobachevsky State University of Nizhny Novgorod,
23, Gagarin Ave., Nizhny Novgorod, 603022, Russian Federation, e-mail: kyul@yandex.ru
Natalia B. Valetova,
Cand. Sci. (Chemistry), Senior Scientist, Laboratory of Petrochemistry, Research Institute of Chemistry, Lobachevsky State University of Nizhny Novgorod,
23, Gagarin Ave., Nizhny Novgorod, 603022,
Russian Federation,
e-mail: nata-bor-2005@mail.ru
Alexandr V. Mitin,
Cand. Sci. (Chemistry),
Head of Laboratory of Chromatography,
Mass Spectroscopy and Elemental Analysis,
Research Institute of Chemistry,
Lobachevsky State University
of Nizhny Novgorod,
23, Gagarin Ave., Nizhny Novgorod, 603022, Russian Federation, e-mail: ckp@ichem.unn.ru
Ludmila L. Semenycheva,
Dr. Sci. (Chemistry), Associate Professor, Head of Laboratory of Petrochemistry, Research Institute of Chemistry, Lobachevsky State University of Nizhny Novgorod,
23, Gagarin Ave., Nizhny Novgorod, 603022, Russian Federation, El e-mail: llsem@yandex.ru
Оlga N. Smirnova,
Cand. Sci. (Biology), Assistant Professor, Senior Scientist,
Laboratory of Microbiological analysis, Research Institute of Chemistry,
ducts of alkyl-9-BBN // Journal of the American Chemical Society. 1996. Vol. 118. Issue 3. P. 705706. https://doi.org/10.1021/ja9527737
СВЕДЕНИЯ ОБ АВТОРАХ
Уромичева Марина Алексеевна,
магистрант,
Нижегородский государственный университет им. Н.И. Лобачевского,
603022, г. Нижний Новгород, пр-т Гагарина, 23,
Российская Федерация,
e-mail: kozinamarina1@yandex.ru
Кузнецова Юлия Леонидовна,
к.х.н., доцент кафедры органической химии, Нижегородский государственный университет им. Н.И. Лобачевского,
603022, г. Нижний Новгород, пр-т Гагарина, 23, Российская Федерация, e-mail: kyul@yandex.ru
Валетова Наталья Борисовна,
к.х.н., старший научный сотрудник лаборатории нефтехимии, Научно-исследовательский институт химии, Нижегородский государственный университет им. Н.И. Лобачевского,
603022, г. Нижний Новгород, пр-т Гагарина, 23, Российская Федерация, e-mail: nata-bor-2005@mail.ru
Митин Александр Вячеславович,
к.х.н., заведующий лабораторией хроматографии, масс-спектрометрии и элементного анализа, Научно - исследовательский институт химии, Нижегородский государственный университет им. Н.И. Лобачевского,
603022, г. Нижний Новгород, пр-т Гагарина, 23, Российская Федерация, e-mail: ckp@ichem.unn.ru
Семенычева Людмила Леонидовна,
д.х.н., доцент,
заведующая лабораторией нефтехимии, Научно - исследовательский институт химии, Нижегородский государственный университет им. Н.И. Лобачевского,
603022, г. Нижний Новгород, пр-т Гагарина, 23, Российская Федерация, И e-mail: llsem@yandex.ru
Смирнова Ольга Николаевна,
к.б.н., доцент, старший научный сотрудник лаборатории микробиологического анализа, Научно - исследовательский институт химии, Нижегородский государственный университет
Lobachevsky State University of Nizhny Novgorod,
23, Gagarin Ave., Nizhny Novgorod, 603022, Russian Federation, e-mail: protectfun@mail.ru
Contribution of the authors
The authors contributed equally to this article.
Conflict interests
The authors declare no conflict of interests regarding the publication of this article.
The final manuscript has been read and approved by all the co-authors.
The article was submitted 15.01.2021. Approved after reviewing 26.02.2021. Accepted for publication 28.02.2021.
им. Н.И. Лобачевского,
603022, г. Нижний Новгород, пр-т Гагарина, 23, Российская Федерация, e-mail: protectfun@mail.ru
Заявленный вклад авторов
Все авторы сделали эквивалентный вклад в подготовку публикации.
Конфликт интересов
Авторы заявляют об отсутствии конфликта интересов.
Все авторы прочитали и одобрили окончательный вариант рукописи.
Поступила в редакцию 15.01.2021. Одобрена после рецензирования 26.02.2021. Принята к публикации 28.02.2021.
Оригинальная статья / Original article УДК 543.241.8
DOI: https://doi.org/10.21285/2227-2925-2021 -11 -1 -26-33
Применение логарифмических диаграмм при оценке равновесных концентраций всех частиц в кислотно-основной системе
© Б.Б. Танганов
Восточно-Сибирский государственный университет технологий и управления, г. Улан-Удэ, Российская Федерация
Резюме: До недавнего времени равновесные концентрации в кислотно-основных системах ввиду отсутствия иных приемлемых подходов изучались с привлечением метода измерения лишь рН раствора. В отношении неводных растворов данный метод не может быть использован. Известно, что на ионную силу раствора, являющуюся основополагающей составляющей при оценке коэффициента активности и термодинамической константы диссоциации электролита, оказывают влияние присутствующие в системе ионы, концентрация которых переменна в процессе взаимодействия в водных и в более сложных неводных растворах, значительно отличающихся своими физико-химическими свойствами (температура кипения, строение, диэлектрическая проницаемость, константа автопротолиза, сольватирующая способность, дипольный момент, вязкость и др.). Между тем для более объективных, более обоснованных оценок кислотно-основных взаимодействий помимо активности ионов водорода требуется корректный учет равновесных концентраций всех частиц в растворе, влияющих на ионную силу раствора. На основании известных закона действующих масс и уравнений, выражающих равновесные процессы, ионное произведение растворителя, электронейтральность и материальный баланс в растворе, выведены соответствующие уравнения и предложен метод, позволяющий учесть влияние концентраций всех частиц в системе (не только ионов водорода - рН), в немалой степени влияющих на свойства кислотно-основной равновесной системы. Данный метод также позволяет выразить зависимость равновесных концентраций всех участников процесса от состояния среды (исследуемого раствора), определяемой разными химическими и инструментальными методами в логарифмических координатах, дающих возможность непосредственной оценки равновесных концентраций всех присутствующих в системе частиц.
Ключевые слова: кислотно-основные системы, равновесные концентрации всех частиц, логарифмическая диаграмма, дифференцирующий растворитель, ацетон
Для цитирования: Танганов Б.Б. Применение логарифмических диаграмм при оценке равновесных концентраций всех частиц в кислотно-основной системе. Известия вузов. Прикладная химия и биотехнология. 2021. Т. 11. N 1. С. 26-33. https://doi.org/10.21285/2227-2925-2021-11-1-26-33
The application of logarithmic charts when evaluating the equilibrium concentrations of all particles in acid-base systems
Boris B. Tanganov
East Siberian State University of Technology and Management, Ulan-Ude, Russian Federation
Abstract: Until recently, due to the absence of other suitable approaches, equilibrium concentrations in acid-base systems have been studied exclusively by measuring the pH of a solution. However, this method cannot be used for organic (non-aqueous) solvent solutions. It is known that the ionic strength of a solution, which is a fundamental component in assessing the activity coefficient and the thermodynamic dissociation constant of an electrolyte, is influenced by the ions present in the system. The concentration of these ions is variable during interactions in aqueous and more complex non-aqueous solutions, which differ significantly in their physicochemical properties (boiling temperature, structure, permittivity, autoprotolysis constant, solvat-ing ability, dipole moment, viscosity, etc.). Meanwhile, in order to obtain more objective and valid estimates of acid-base interactions, in addition to the activity of hydrogen ions, appropriate account should be taken of the equilibrium concentrations of all particles in the solution, which affect its ionic strength. In this article, on
